ASME B31.9-2020 pdf download
ASME B31.9-2020 pdf download.Building Services Piping.
joint penetration: the minimum depth a groove weld extends from its face into a joint, exclusive of reinforcement. Joint penetration may include root penetration. See root penetration.
liquidus: the lowest temperature at which a metal or alloy is completely liquid.
main: as used in this Code, a section of pipe to which a branch or branches are connected.
manual welding: welding wherein the entire welding operation is performed and controlled by hand.
manufacturer’s weld line: for integrally reinforced branch connection fittings, the apex of the weld preparation bevel angle and the secondary bevel angle. See Figure 927.4.6-3.
maximum allowable stress: the maximum stress value that may be used in the design formulas for a given material and design temperature. Stress values tabulated in Mandatory Appendix I are for stress in tension.
may: as used in this Code, denotes permission or indifference; it is neither a requirement nor a recommendation.
mechanical joint: a pipe joint in which mechanical strength is developed by threaded, grooved, rolled, compressed, flared, or flanged pipe ends, with gasketed, caulked, or machined and mated surfaces for leak resistance.
melting range: the temperature range between solidus and liquidus of a metal.
miter joint: two or more straight sections of pipe joined (in pairs) on a line bisecting the angle of junction so as to produce a change in direction.
nominal: a dimension of a product as given in a standard or specification, prior to consideration of tolerances; also, a designated size or rating, not necessarily an actual measurement.
nominal thickness: the thickness given in the product specification to which manufacturing tolerances are applied.
NPS: nominal pipe size.
owner: the party or organization responsible for the construction and operation of a facility. The owner is usually the one who has applied for, or who has been granted, a construction permit or operating license by the regulatory authority having jurisdiction.
oxidizing flame: an oxyfuel gas flame having an oxidizing effect due to excess oxygen.
oxyacetylene welding (OAW): a gas welding process in which coalescence is produced by heating with a gas flame or flames obtained from the combustion of acetylene with oxygen, with or without the application of pressure and with or without the use of filler metal.
oxyfuel gas welding (OFW): a group of welding processes in which coalescence is produced by heating with a flame or flames obtained from the combustion of fuel gas
preheating (PH): the application of heat to the base metal immediately before welding, brazing, soldering, cutting, or forming.
procedure: the detailed elements (with prescribed values or range of values) of a process or method used to produce a specific result.
procedure qualification: the demonstration that welds or other work produced by a specified procedure can meet prescribed standards.
purge gas: the replacement of air within a piping system with an inert gas; may be required by the Welding Procedure Specification prior to making a gas tungsten arc weld.
qualification: see preferred terms procedure qualification and Welder Performance Qualification.
recommend: has the same effect as should.
reducing flame: an oxyfuel gas flame having a reduced effect due to excess fuel gas.
reinforcement: in branch connections, reinforcement is material around a branch opening that serves to strengthen it. The material is either integral in the branch components or added in the form of weld metal, a pad, a saddle, or a sleeve. In welding, reinforcement is weld metal in excess of the specified weld size.
restraint: a structural attachment, device, or mechanism that limits movement of the pipe in one or more directions. See pipe alignment guide.